code: def testBasicDispatch(self):
      dispatcher = dispatch.PythonAPIDispatcher(
          "tf.foo", ["x", "y", "name"], (None,)
      )
  
      rt_checker = dispatch.MakeInstanceChecker(
          ragged_tensor.RaggedTensor
      )
      f1 = lambda x, y, name=None: "f1"
      dispatcher.Register(
          dispatch.PySignatureChecker([(0, rt_checker)]), f1
      )
  
      rt = ragged_factory_ops.constant([[1, 2], [3]])
      self.assertEqual(dispatcher.Dispatch((rt, 5), None), "f1")
      self.assertEqual(
          dispatcher.Dispatch((rt, 5, "my_name"), None), "f1"
      )
      self.assertEqual(dispatcher.Dispatch((), {"x": rt, "y": 5}), "f1")
      self.assertEqual(
          dispatcher.Dispatch((), {"x": rt, "y": 5, "name": "x"}), "f1"
      )
      self.assertEqual(
          dispatcher.Dispatch(("foo", rt), None), NotImplemented
      )
      self.assertEqual(
          dispatcher.Dispatch(("foo", "bar"), None), NotImplemented
      )
      self.assertEqual(
          dispatcher.Dispatch(("foo", "bar", "baz"), None),
          NotImplemented,
      )
  
imports: import collections
  import numpy
  from tensorflow.python.framework import _pywrap_python_api_dispatcher
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 1 for calling the PythonAPIDispatcherTest obj's underlying member method code with example usage: obj.testBasicDispatch() without return types